ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued payroll and employee benefits	$ 1,209	$ 2,166
Accrued property taxes	661	748
Other	2,547	2,667
Accrued liabilities	$ 4,417	$ 5,581